Irrigation rotary piston action pump



J une 17,1941. L. JO-HNSON IRRIGATION ROTARY' PISTON ACTION PUMP Filed Aug 8, 1939 with Patented June 17, 1941 STATS TET or ies 2 Claims.

This invention relates to pumps especially adaptable for irrigation and similar work and has for the primary object the provision of a device of this character which will force liquid with a minimum saving in motive power and is so constructed that any of the parts thereof may be readily renewed when worn and which embodies a construction which will be durable and efficient and may be manufactured and sold at a low cost.

With these and other objects in View, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a side elevation partly in section illustrating a pump constructed in accordance with my invention and having the cover plate thereof removed.

Figure 2 is a sectional view taken on line 22 of Figure 1.

Figure 3 is a transverse sectional view taken on line 3-3 of Figure 1.

Referring in detail to the drawing, the numeral I indicates a pump housing having therein a piston chamber 2 which, horizontally, is rectangular, but, vertically, is of elongated, substantially elliptical shape and communicating with said chamber are passages 3 and 4. Either of these passages may form the inlet or th outlet for the pump depending in which direction the pump is driven. For convenience of description the passage 3 will be termed the inlet and the passage 4 the outlet. The housing has the passages 3 and 4 separated by an abutment 5 in which is provided a space 6. The housing includes a removable cover plate 1 providing one of the side walls of the housing while the opposite side wall of the housing is offset adjacent each end of the piston chamber to provide journals 8 and circular recesses 9, and operating in said recesses 9 are discs Ill, the pintles II thereof being received in the journals 8. A rectangular plate forming a piston I2 is pivoted at its ends crankwise on the discs I0 and has wiping contact at its longitudinal margins with the opposite sides of the piston chamber, and also has alternating wiping contact at its ends with the curved ends of the piston chamber. The plate-like piston intermediate its ends is provided with a rounded, undercutgrooved, transverse enlargement providing a journal I3 to receive at one end a crank pin I4 of a drive disc I5 and which also pivotally connects to the plate-like piston a division plate I5 having a round beaded enlargement at one end to fit rotatably in the journal groove. A shaft I5 of the drive disc I5 is journaled in a bearing I! formed in the removable wall 1 of the housing I and has secured thereto a pulley I8 or some other similar medium for applying power to the shaft I5. The drive disc I5 seats in a recess formed in the removable wall 1 of the housing so that it will not interfere with the motion of the plate-like piston I2. The division plate I6 is slidably received in a slot of a shaft I 9 fitted rotatably throughout the major portion of its length in a portion of the abutment 5 which is accordingly slotted (see Figure 1) and the ends of the shaft being received in recessed bearing portions of the housing walls (see Figure 3). The division plate I 6 has wiping contact with the opposite sides of the housing and its motion is both oscillatory and longitudinally slidable so as to readily follow the movement of the plate-like piston I2. The plate-like piston due to its cranked mountings will have a motion which may be termed a compound eccentric bar motion.

In operation, the motion of the plate-like piston is towards and from the upper wall A of the piston chamber, also towards and from the curved end walls B of the piston chamber. When the passage 3 is considered as the inlet the discs I0 rotate in the direction indicated by the arrow so that when the left hand end of the plate-like piston moves from the position 0 successively, first downwardly and longitudinally, to the position D, and thence upwardly and longitudinally to the position E, liquid from the intake 3 is lifted upwardly into the space between the platelike piston and the top Wall A. On continued movement of the left hand end of the plate-like piston from the position E to the position F, the liquid in said space is placed under pressure and forced outwardly around the right hand end of the plate-like piston into the outlet passage 4 under considerable pressure. The separating plate I 6 prevents the outgoing liquid under pressure from re-entering the inlet passage 3.

What is claimed is:

1. In a pump, a housing having an elongated piston chamber of generally rectangular form, the opposite end portions of which are semicylindrical, and an inlet and a parallel outlet communicable with said chamber near the ends thereof, supporting guides rotatably mounted in the opposite end portions of the said chamber, an elongated platelike piston marginally contiguous to the opposite side walls of the chamber, said piston having the ends thereof pivotally attached crankwise to said rotatable supporting guides whereby to travel with parallel orbital motion in said chamber, said piston ends during part of such travel being peripherally contiguous to the end portions of said chamber, a driven shaft journaled in said housing, a crank element secured to said shaft whereby to rotate therewith and having a pivotal attachment to said piston intermediate the ends thereof, and a movable dividing plate provided within the housing for separating the inlet and outlet, said dividing plate being pivotally attached at one end to the piston intermediate the ends of the latter and having a mounting on the housing with provision for a combined. oscillation and lengthwise reciprocation of said dividing plate in compensation with the parallel orbital motion of the piston.

2. In a pump, a housing having an elongated piston chamber of generally rectangular form, the opposite end portions of which are semicylindrical, and an inlet and a parallel outlet communicable with said chamber near the ends thereof, supporting guides rotatably mounted in the opposite end portions of the said chamber, an elongated platelike piston marginally contiguous to the opposite side walls of the chamber, said piston having the ends thereof pivotally attached crankwise to said rotatable supporting guides whereby to travel with parallel orbital motion in said chamber, said piston ends during part of such travel being peripherally contiguous to the end portions of said chamber, a driven shaft journaled in said housing, a crank element secured to said shaft whereby to rotate therewith and having a pivotal attachment to said piston intermediate the ends thereof, and a movable dividing plate provided within the housing for separating the inlet and outlet, said dividing plate being marginally contiguous to the opposite side Walls of the housing and pivotally attached at one end to the piston intermediate the ends of the latter, a longitudinally-slotted rockshaft mounted for oscillation in said housing between said inlet and outlet ports, the portion of said dividing plate remote from its end which is attached to the piston and adjacent its opposite end being slidably mounted in said rockshaft, whereby, a combined oscillatory and lengthwise movement is imparted to the dividing plate during the parallel orbital travel of the piston.

HERBERT L. JOHNSON. 

